Boron Trihalide Mediated Haloallylation of Aryl Aldehydes and Its Application to the Preparation of (E)-1,3-Dienes
作者:George Kabalka、Michael Quinn、Min-Liang Yao、Li Yong
DOI:10.1055/s-0031-1289304
日期:2011.12
In the presence of boron trihalides, aryl aldehydes couple readily with allylmetals to afford haloallylated products. The reactions tolerate a variety of functional groups. Simple aqueous workup of haloallylation reactions, followed by treatment with 1,8-diazabicyclo[5.4.0]undec-7-ene, provides a straightforward route to synthetically useful (E)-1,3-dienes. The mild reaction conditions, readily available
在三卤化硼存在下,芳基醛容易与烯丙基金属偶合,得到卤代烯丙基化产物。反应可耐受多种官能团。简单的卤代烯丙基化反应的水性处理,然后用1,8-二氮杂双环[5.4.0] undec-7-ene处理,为合成有用的(E)-1,3-二烯提供了直接途径。温和的反应条件,容易获得的起始原料以及高的立体选择性使这种两步式(E)-1,3-二烯合成非常有吸引力。 三卤化硼-烯丙基金属-卤代烯丙基-二烯-立体选择性